<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧 -->
			<scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
				<view :class="['left-scroll-view-item',i==active?'active':'']" v-for="(item,i) in cateList" :key="i"
					@click="activeChanged(i)">{{item.cat_name}}</view>
			</scroll-view>
			<!-- 右侧 -->
			<!-- 右侧的滚动视图区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>

					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		  // 将 badgeMix 混入到当前的页面中进行使用
		  mixins: [badgeMix],
		data() {
			return {
				//当前设备可使用的高度
				wh: 0,
				// 分类数据列表
				cateList: [],
				// 当前选中项的索引，默认让第一项被选中
				active: 0,
				// 二级分类列表
				cateLevel2: [],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight-50
			// 调用获取分类列表数据的方法
			this.getCateList()
		},
		methods: {
			async getCateList() {
				// 发起请求
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				// 判断是否获取失败
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				// 为二级分类赋值
				this.cateLevel2 = res.message[0].children
			},
			// 选中项改变的事件处理函数
			activeChanged(i) {
				this.active = i
				// 为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				//右侧滚动条重置为0或者1
				this.scrollTop=this.scrollTop===0?1:0
			},
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
		background-color: #fff;

		.left-scroll-view {
			width: 120px;
		}

		.left-scroll-view-item {
			.cate-lv2-title {
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px 0;
			}

			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;

			&.active {
				background-color: #ffffff;
				position: relative;

				// 渲染激活项左侧的红色指示边线
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}

	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
		// background-color: #ffff00
	}
	.cate-lv3-list{
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item{
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 10px;
			image{
				width: 60px;
				height: 60px;
			}
			text{
				font-size: 12px;
			}
			
		}
	}
</style>